let single = 'single-quoted';
let double = "double-quoted";

let backticks = `backticks`;

function sum(a, b) {
    return a + b;
}

alert(`1 + 2 = ${sum(1, 2)}.`);

let guestList = `Guests:
 * John
 * Pete
 * Mary
 `;

 alert(guestList);